KEP-2170: Add directories for the V2 APIs

[andreyvelich]

Related: https://github.com/kubeflow/training-operator/issues/2206

I added directory structure for the V2 APIs.

/assign @tenzen-y @kubeflow/wg-training-leads

[coveralls]

Pull Request Test Coverage Report for Build 10407466004

Details

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 33.469%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/training-operator.v2alpha1/main.go	0	3	0.0%
<!--	Total:	0	3	0.0%	-->

Totals
Change from base Build 10353886679:	0.0%
Covered Lines:	3949
Relevant Lines:	11799

---

💛 - Coveralls

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: terrytangyuan

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[tenzen-y]

/lgtm

[tenzen-y]

/lgtm